Punching-machine



1. ,DREWES. PUNCHING MACHINE. APPLICATION FIL'ED NQV. I0. 1919.

OOOOOOOOOOOOOOOOOOOO OOOOQOOOOOOOOOO0000000000 Patented Jline 7, 1921.

JOH'ANNES DREWES, 0F GIDEON, NETI-IERLANDS.

PUNGI-IING-MACI-IINE.

To all whomit may concern:

Be it known that I, JoHANNEs Dnnwns, a subject of the Queen oftheNetherlands, residing at Gideon, near Groningen,Netherlands, haveinvented certain new and useful Improvements in Punching-Machines, ofwhich the following is a specification.

Punching machines have been proposed in which a plurality of punches aremounted in a common reciprocating block. They serve the purpose ofpunching a complete serles of holes at eachworking stroke 0 1 themachine.

The main object of my present invention is to make said machinessuitable for perforating plates in which the numbers of holes insuccessive series are unequal. With this and other objects in view Iconnect one or a plurality of punches, or punch holders, pivotally withthe said block, preferably so as to adapt them toturn in a plane atrightangles to the axis of the row of punches, and I associate saidpunches, or punch holders, with means by which they may be swung out andthereby rendered in operative.

Other'features of my present lnvention will be described with referenceto the annexed drawing and more particularly pointed out in the claims.

In the drawing: 7 V

Figure 1 is a front elevational view of a machine constructed inaccordance with my new principles, some of its parts .being omitted;

Fig. 2 is a sectional view along line A-A in Fig. 1, and I Fig. 8illustrates ,part of a ships plate as may be perforatedsemi-automatically by a machine shownin Figs. 1 and 2 and provided witha suitable number of punches.

The illustrated machine comprises two supports 1 and 2 for the mainshaft 3 which carries a loose gear 4. The said g'earmeshes with. apinion 5 on a shaft 6 provided with a pulley 7 Secured on shaft 3 is adisk 8 which may be coupled with and released 7 from the gear 4: bymeans of a mechanism 9, the exact construction of which 1s of no1mportance as far as my invention is con-.

cerned. p

On the shaft 3,are keyed two eccentric 5 disks 10, 10 having freedom ofrotation in Specification of Letters Patent.

Patented June '7, 1921.

Application filed November 10, 1919. Serial No. 336,873.

recess of block 12 in the direction of the arrow shown in Fig. 2. Eachpunch holder 1s adapted to receive a punch 15.

Supported in bearings of the block 12 are two horizontal shafts 16 and17. Each holder 14 is pivotally connected by means of a link 18 with alever 19 on shaft 16; the pivot connecting the parts 18 and 19 isconnected by a link .20 with the end of a lever 21 on shaft 17. Thelevers 19 and 21 are adapted to be rigidly secured on the shafts 16 and17 respectively by means of set screws 16- and 17*. By releasing thesescrews the said levers may be uncoupled from said shafts. Keyed on shaft16 is a handle it cooperating with an arcuate guide piecec provided witha slot in which the said handle may be secured, for instance by aclamping. screw.

On shaft 17 is secureda lever 22 provided at its end with anantifriction roller 28. A coiled spring 17 on shaft 1'? always tends topress the said roller in a counter clockwise direction against a cam 24.Said cam is keyed on a shaft 25 supported in suitable bearings of theblock 12 and. carrying a ratchet wheel 26 cooperating with a pawl 27.The pawl 27 is mounted in aframe 28 which is loosely mounted on shaft 25and pivotally connected by a lever 29 with a shaft 30 supported inbearings of the slides 11 and 11 The distance between the pivotconnecting leve r'29 and frame 28, andshaft 25 may be increased orreduced by means of a screw 81 which is preventedfrom moving axially inthe frame 28 and which coacts pawl 36 mounted in a frame 37 which ispivotally connected by a rod 38 to a traveling nut 39 mounted on thelatter being rotatable within a block 41 but prevented from endwisemovement therein. The block 41 is secured to a disk 42 on shaft 3; thesaid disk 42 is provided with a radial slot in which the nut 39 isadapted to reciprocate. It will be understood that owing to a rotationof screw the nut 39 will move radially over disk 42, whereby the lengthof stroke of rod 38 may be varied. The pawls 27 and 36 are looselymounted in their frames 28 and 37, and are provided with enlarged upperends or heads 27 and 36 by means of which they may be lifted out ofengagement with their ratchet wheels. These heads are provided on theirunder faces with depending lugs or projections 27 and 36 adapted to fitin diametrically opposite recesses in the frames, so that the pawlsafter having been lifted out of engagement with the ratchets, may beturned through 180 and then reengaged therewith in inoperative position,the projections and recesses coacting to hold the pawls in eitherposition.

The shaft 34 further carries two rollers 43, 48 for supporting theflanges of the beams 32, 32, and rollers 44, 44 for supporting the workpiece to.

Mounted on a shaft 45 supported by the frame of the machine are threebell crank levers 46, each of which is provided at one end with anantifriction roller 47, its other end carrying a stud 48 projecting intoa curved slot in a guide piece 49, whereby the lever 46 may be securedso that the roller 47 presses the work piece 20 on the die 50.

The main shaft 3 of the machine carries two cams 51,51 enacting withpins 52, 52? which are suitably guided in a vertical direction and whichare pressed by springs against the saidcamsl The pins 52, 52 are taperedat their lower ends. If I wish to perforate the work piece to in such amannor that the number of holes in all series is the same andcorresponds with that of the punches in the machine, I may for instance,secure all levers 21 to the shaft 17 by tightening their set screws 17,and lf render the pawl 27 inoperative, for instance, by turning itthrough 180 about its longitudi nal axis as explained above; at the sametime I see to it that the cam 24 assumes the position shownin Fi 2, thatis a position wherein the shaft 1 under the action of the coiled spring17'" holds the punches in their operative positions. stood that underthese conditions my machine operates in quite the same manner as theordinary punching machines having a plurality of stationary punchesarranged side by side.

If during the operation of the machine a distinct punch or a pluralityof distinct It will be under- In case it is necessary for selectedpunches to automatically or periodically become operative andinoperative, I throw the pawl 27 into operative engagement with theratchet wheel 26, whereby the cam 24, owing to the horizontal motion ofthe slides 11, 11 ,,ism

periodically turned through a given angular distance. As long as theroller 23 engages the recessed portion of the cam 24, those punchholders whose lever system 18, 19, 20, 21 is rigidly secured to shaft17, remain in their operative positions. ever the lever 22 is turned bythe cam. 24 through a given angular distance in a clockwise direction,the said punch holders will be swung out and become inoperative. v

means of the screw 40 the distance through which the work piece to isfed at each revolution of shaft 3 may be varied with a view to the pitchof the series of holes. With the aid of screw 31 I may control theangular displacement of the cam 24 per revolution of shaft 3, andconsequently the movements of the punch holders that are fast on theshaft 17.

If it is desired to vary the pitch of the holes in the series, the punchholders 14 are simply replaced by a series of holders having acorresponding thickness in the direction of the axis of the machine.

If, how;

The pins 52, 52 have for their purpose to hold the work piece in aninvariable position during the punching stroke, in a manner well knownin the a The length of the punches decreases from the center of theseries toward both ends,

whereby I realize the advantage that the punching pressure graduallyincreases during the working stroke.

What I claim as my invention is:

1. in a punching machine, the combina intervals for positively tion of areciprocatory'block formed with a inoperative position.

5. In a punching machine, the combination of a reciprocatory element; aplurality of punching devices pivoted thereto; a rock shaft to which allof the punching devices are individually connectible to swing intoinoperative position when said shaft is turned; and means forautomatically actuating said shaft.

6. In a punching machine, the combination of a reciprocatory element; aplurality of punching devices pivoted thereto; a rock shaft to which allof the punchingdevices are individually connectible to swing intoinoperative position when said shaft is turned; and means operatingautomatically at predetermined intervals to actuate said shaft.

7. In a punching machine, the combination of a reciprocatory element; aplurality of punching devices pivoted thereto; a rock shaft to which allof the punching devices are individually connectible to swing intoinoperative position when said shaft is turned; operating mechanism forthe reciprocatory element; a cam operatively connected with saidmechanism; and connections between said cam and said shaft forautomatically operating the latter from the former.

8. In a punching machine, the, combination of a reciprocatory element;operating mechanism therefor; a plurality of punching devices pivoted tosaid element to move therewith; means connected to swing a selectedpunching device or devices relatively to said reciprocatory element intoan inoperative position; a cam connected to be driven from saidoperating mechanism; and connections between said cam and said swingingmeans for automatically. operating the latter from the former.

9. In a punching machine, the combination of a reciprocatory element; aplurality of punching devices pivoted thereto; and mechanism forautomatically and positively swinging a selected punching device ordevices alternately into and out of inoperative position.

10. In a punching machine, the combinationofa reciprocatory element; aplurality of punching devices pivoted thereto; and mechanism forautomatically and positively swinging a plurality of selected punchingdevices simultaneously into inoperative position.

11.'In a punching machine, the comb-ination of a reciprocatory element;a; plurality of punching devices pivoted thereto; and mechanism forautomatically and positively swinging a plurality of selected punchingdevices simultaneously first into inoperative position and then backinto operative position.

12. In a punching machine, the combination of a reciprocatory element; aplurality of punching devices pivoted thereto for swinging movement; anoscillatory shaft disposed parallel with the axis of movement of thepunching devices; operating mechanism for the reciprocatory element; acam connected to be operated by said mechanism; a lever system betweensaid punching devices and said shaft to operate the former from thelatter; and a projecting member carried by said shaft for engagement bysaid cam.

13. In a punching machine, the combination of a reciprocatory element; aplurality of punching devices pivoted thereto for swingingmovement; apair of oscillatory shafts disposed parallel with the axis of movementof the punching devices; a lever system between the punching devices andone of the oscillatory shafts; mechanism for automatically operatingsaid reciprocatory element and said lever system; a connection betweenthe other oscillatory shaft and the lever system; and means for manuallyoperating said other oscillatory shaft and holding it in adjustedposition.

14. A punching machine comprising a re- I ciprocatory carrier; aplurality of punching devices attached to the carrier to move therewith,but capable of movement relative to said carrier into and out ofinoperative position; and mechanism for simultaneously moving aplurality of selected punching devices, to the exclusion of the others,into inoperative position. i

15. A punching machine comprising a reciprocatory carrier; a pluralityof punching devices attached to the carrier to move therewith, butcapable of movement relative to said carrier into and out of inoperativeposition; and mechanism periodically moving a plurality of selectedpunching devices into inoperative position.

16. A punching machine comprising a reciprocatory carrier; a pluralityof punching devices attached to the carrier to move therewith, butcapable of movement relative to said carrier into and out of inoperativeposition; and mechanism operable automatically to move a plurality ofselected punching devices, at predetermined regular intervals first'intoinoperative position and then into operative position.

17. A punching machine comprising a reciprocatory carrier; a pluralityof punching devices attached to the carrier to move there'- With, butcapable of movement relative to said carrier into and out of inoperativep0- 'sition; and mechanism operable automatically and simultaneouslyupon a plurality of selected punching devices, to the exclusion ofothers to move them first into one of such position. I v r I Intestimony whereof I aflix my signature; r J OHANN'ES DREWES.

position and then into the other

